A/C whining noise when decelerating

Tiny
RUSTY17FLA
  • MEMBER
  • 2003 KIA SPECTRA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
Hi, my car recently started making an odd whining/humming noise coming from engine area. It only happens when slowing down and when the A/C is on. As the engine slows down, this whining winds down as well. My brother lives in another state but when I explained it to him over the phone, he said it sounded like the bearing in the A/C motor. I brought it to a mechanic but he could not find anything wrong and told me not to worry about it. I hope that it is nothing to worry about, but would hate to find out later I could have preemptively saved myself hundreds of dollars spent on A/C repairs. Any ideas? Thank you so much in advance.
Cheryl
Wednesday, November 5th, 2008 AT 3:20 PM

3 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

I would be getting a second opinion on the A/C clutch bearing and the belt idler pulley bearing, if it is only there with the A/C on it will be in this area.

Mark (mhpautos)
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Wednesday, November 5th, 2008 AT 3:28 PM
Tiny
CHEMALURGY
  • MEMBER
  • 5 POSTS
Sounds like an alternator whine. Have the tension in the alternator belt checked.
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Saturday, June 30th, 2018 AT 12:17 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,589 POSTS
Great addition to this thread! Please feel free to help out whenever you are on the site. :)

Cheers, Ken
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Monday, July 2nd, 2018 AT 12:01 PM

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